ZonePopper vs Light Spectrometer Wavelength
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ZonePopper
Control EtherRain irrigation systems directly from your iOS device. Easily initiate manual watering cycles and perform valve tests for convenient system management. Requires connection to the same WiFi network as your controllers.
- Immediate zone control
- Manual cycle execution
- Valve testing
- WiFi network connection
- Help guidance
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ZonePopper provides immediate zone control for EtherRain controllers. It is used to conveniently run manual cycles and to provide valve tests. To use ZonePopper your iOS device must be connected to the WiFi network that your EtherRain controllers are attached to. The Help page provides guidance on how to use ZonePopper.
Light Spectrometer Wavelength
This application analyzes light to determine its dominant wavelength in nanometers, frequency in terahertz, and period length in femtoseconds. It provides real-time measurements and allows users to save their findings with notes. The app is designed for measuring colored light sources.
- Measures dominant wavelength (nm)
- Measures frequency (THz)
- Measures period length (fs)
- Real-time measurement
- Save measurements with notes
- Optional calibration
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Measures light spectrum to determine the dominant wavelength in nm, frequency in THz and period length in fs. DOMINANT WAVELENGTH Dominant wavelength is a concept commonly used in the field of color science and perception. It refers to the wavelength of light that appears most prominent or dominant in a given color mixture or light source. In other words, it is the wavelength that our eyes perceive as the primary color in a mixture of different wavelengths. For light with only one wavelength, such as the light from a colored LED, the dominant wavelength corresponds to the wavelength of that light. KEY FEATURES • High accuracy • Real-time measurement • Measures light wavelength in nanometers (nm) • Measures light frequency in terahertz (Thz) • Measures light period length in femtoseconds (fs) • Easy to use • Save measurements with notes • Supports 40 languages, including english • Optional calibration for enhanced precision MEASURING 1. Find a white surface, such as a plain piece of white paper 2. Point your camera at the surface illuminated by your target light source 3. The app gives you accurate measurements in real-time LIMITATIONS Smartphone cameras have limitations when it comes to distinguishing between different very short, or very long wavelengths. More specifically, on many devices the accuracy below 465 nm and above 610 nm is very limited. This is due to the physical camera sensors in the devices. An automatic warning appears on the screen for these short and long wavelengths. WHITE LIGHT Note that is not meaningful to measure the dominant wavelength of white light as white light consists of a wide range of wavelengths, with no wavelength dominating. This app is made for measuring colored light. If you are interested in determining the color temperature of white light, please instead use our popular White Balance Kelvin Meter app. COLOR OF SURFACES If you want to measure the color of a surface or material, rather than of light, please instead use our popular Colorimeter Camera Color Meter app. Privacy Policy, https://spectrometer.contechity.com/pp.html End User License Agreement, https://spectrometer.contechity.com/eula.html CONTACT I value your feedback. Email me at apps@contechity.com with any suggestions or questions. Download the Spectrometer now!
Screenshots
Verdict
The clearest difference is review sentiment: Light Spectrometer Wavelength at 71% against ZonePopper's 0%. Light Spectrometer Wavelength also leads on price (Free vs $16.99) and update cadence (every 2 months vs every 38 months). ZonePopper's advantage is in-app purchases (none vs 7). On ads, device support and iOS requirement there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Light Spectrometer Wavelength is free to download; ZonePopper costs $16.99 up front. Light Spectrometer Wavelength sells 4 in-app purchases, starting at $0.99 per month. ZonePopper asks for nothing beyond the download.
Light Spectrometer Wavelength holds the better App Store score, 4.2 against 4.0. That said, the two scores are not equally well evidenced: Light Spectrometer Wavelength has 96 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 0% of ZonePopper's written reviews are positive against 71% of Light Spectrometer Wavelength's.
ZonePopper ships an update every 38 months, Light Spectrometer Wavelength every 2 months. The most recent releases landed on October 24, 2026 and October 30, 2026 respectively.
| Parameter | ZonePopper | Light Spectrometer Wavelength |
|---|---|---|
| Price | $16.99 | Free — better |
| Rating | 4.0 (2 ratings) | 4.2 (96 ratings) — better |
| Positive reviews | 0.0% of reviews | 70.6% of reviews — better |
| Number of ratings | 2 | 96 — better |
| Update frequency | Every 38 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Free with in-app purchases — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 15.0 |
| Further details — not scored | ||
| Size | 49 MB | 43 MB |
| Age rating | 4+ | 4+ |
| Developer | James Lemezis | Contechity AB |
Customer experience
ZonePopper
Light Spectrometer Wavelength
In-app purchases
ZonePopper
No in-app purchases
Light Spectrometer Wavelength
- Full Access7 Days trial$0.991 Month
- Full access14 Days trial$0.991 Month
- Full access$4.991 Year
- Full access4 variants$6.99
Questions
Is ZonePopper free?
Is Light Spectrometer Wavelength free?
Which has better reviews, ZonePopper or Light Spectrometer Wavelength?
Do ZonePopper or Light Spectrometer Wavelength have ads?
Which is updated more often, ZonePopper or Light Spectrometer Wavelength?
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